The 66-year-old actor-turned-politician had been admitted to Kokilaben Hospital on July 2 after he complained of breathlessness due to some paint work at his residence.
"Sinha was admitted to the hospital following respiratory complaints. He is still in the hospital and stable. He tends to get breathless... He is being observed closely," Dr Ram Narain, COO, Kokilaben hospital, told PTI.
The actor will remain under observation at the hospital for the next few days.
"He will be there in the hospital for a few more days," Narain said.